🛡️ Sentinel: [HIGH] Fix XSS in report generation

[tejasbhor]

🚨 Severity: HIGH
💡 Vulnerability: Cross-Site Scripting (XSS) in backend/app/services/report_service.py due to raw f-string interpolation of user-controlled variables into the HTML report string.
🎯 Impact: A malicious user could inject arbitrary HTML or JavaScript into the generated report, leading to XSS when viewed.
🔧 Fix: Used html.escape() on all dynamic variables (e.g. layer_id, data_source, status, error_msg, alert attributes) injected into the HTML. Ensured string slicing is applied before escaping to avoid malformed HTML entities.
✅ Verification: Ran ruff check and manually verified the XSS prevention using a Python script. Checked .jules/sentinel.md update. Reversed uv.lock changes.

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PR created automatically by Jules for task 6390400998077639152 started by @tejasbhor

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